An apparatus for fabricating an LCD panel includes first and second alignment treatment units for performing alignment treatments on first and second base substrates, a seal pattern forming unit for forming at least one seal pattern on the alignment-treated first base substrate, a cleaning unit for cleaning the first base substrate on which the at least one seal pattern has been formed, a disconnection examining unit operatively coupled to the cleaning unit for examining the at least one seal pattern to determined the presence of defective breaks in the at least one seal pattern, first and second buffer units for temporarily holding the first and second base substrates, respectively, and an attaching unit for loading the temporarily held first and second base substrates and for attaching the loaded first and second base substrates.
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1. A method for fabricating a liquid crystal display panel, comprising:
performing a first alignment treatment on a first base substrate;
performing a second alignment treatment on a second base substrate;
forming at least one seal pattern on the alignment-treated first base substrate;
aligning the first base substrate having the at least one seal pattern formed thereon;
driving a disconnection camera along the at least one seal pattern to detect an image of the at least one seal pattern and identify the presence of defective breaks in the at least one seal pattern;
comparing a detected line width of the at least one seal pattern detected by the disconnection camera with a predetermined reference line width of a predetermined reference seal pattern;
generating an alarm when the difference between the detected line width of the at least one seal pattern and the predetermined reference line width of the predetermined reference seal pattern exceeds a threshold value;
cleaning the first base substrate on which the at least one seal pattern has been formed; and
attaching the first and second base substrates via the at least one seal pattern.
2. The method of
loading the first base substrate onto a table;
dispensing sealant onto the substrate through syringes; and
laterally translating at least one of the table and the syringes along left, right, forward, and backward directions while dispensing the sealant.
3. The method of
aligning a patterned screen mask over the first base substrate, wherein the patterned screen mask selectively exposes regions of the first base substrate; and
applying a squeegee over the patterned screen mask to supply sealant to the regions of the first base substrate that are selectively exposed by the patterned screen mask.
4. The method of
5. The method of
6. The method of
7. The method of
forming a plurality of Ag dots on the second base substrate; and
forming spacers on the second base substrate prior to attaching the first and second base substrates.
8. The method of
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This application claims the benefit of Korean Patent Application No. 90982/2003, filed on Dec. 13, 2003, which is hereby incorporated by reference for all purposes as if fully set forth herein.
1. Field of the Invention
The present invention relates to an apparatus and a method for fabricating liquid crystal display (LCD) panels. More particularly, the present invention relates to an apparatus and a method for efficiently examining seal patterns used in attaching substrate together.
2. Discussion of the Related Art
Generally, LCD devices display images by applying data signals to an array of pixels to thereby control light transmittance characteristics of the pixels, wherein the data signals are derived from external image information. A typical LCD device includes a unit LCD panel having a plurality of pixels arranged in a matrix pattern, and gate and data driving units for driving the pixels.
The LCD panel typically includes a color filter substrate attached to a thin film transistor (TFT) array substrate by a seal pattern formed at a peripheral region of an image display area. The attached color filter and TFT array substrates are separated from each other to define a cell-gap that contains a liquid crystal layer.
The color filter substrate supports a common electrode while the TFT array substrate supports a plurality of gate lines, a plurality of data lines crossing the plurality of gate lines to define a plurality of pixels, a plurality of TFTs arranged at crossings of each of the gate and data lines, and a plurality of pixel electrodes electrically connected to corresponding ones of the TFTs. Alignment films, formed on opposing surfaces of the TFT array and color filter substrates, are rubbed to induce a predetermined orientation of molecules within the liquid crystal layer.
The data lines transmit data signals, supplied from the data driving unit, to the pixels while the gate lines transmit scan signals, supplied from the gate driving unit, to the pixels. In response to scan signals, sequentially supplied from the gate driver, the TFTs switch data signals transmitted by the data lines to corresponding pixel electrodes.
When data and reference signals are applied to the pixel and common electrodes, respectively, an electric field is generated within the liquid crystal layer. Due to anisotropic dielectric properties of molecules within the liquid crystal layer, the generated electric field rotates liquid crystal molecules between the common electrodes and the pixel electrodes. When the liquid crystal molecules rotate, the light transmittance characteristics of the pixels change. Thus, by controlling the magnitude of the generated electric field via the data and reference signals, light transmittance characteristics of the plurality of pixels may be controlled to display an image.
Referring to
The image display area 113 generally includes the portion of a TFT array substrate 101 that is overlapped by a color filter substrate 102. Accordingly, the image display area 113 typically includes the portion of the TFT array substrate 101 that supports a plurality of gate and data lines crossing each other to define pixels, pixel electrodes formed within the pixels, and TFTs arranged at crossings of the gate and data lines and connected to corresponding pixel electrodes for driving the pixel electrodes. A protecting film (not shown) is formed over the entire surface of the TFT array substrate 101 to protect the pixel electrodes and the TFTs. Further, the image display area 113 typically includes the portion of the color filter substrate 102 that supports a black matrix, a plurality of color filters separated by the black matrix, and a common transparent electrode opposing the pixel electrodes.
The gate pad and data pad areas 114 and 115 are found at edges of the TFT array substrate 101 that are not overlapped by the color filter substrate 102. Accordingly, the gate pad area 114 includes a plurality of gate pads that transmit scan signals, supplied by a gate driving unit (not shown), to corresponding ones of the gate lines. Similarly, the data pad area 115 includes a plurality of data pads that transmit image information, supplied by a data driving unit (not shown), to corresponding ones of the data lines.
The TFT array substrate 101 and the color filter substrate 102 are joined to, and spaced apart from, each other via a seal pattern 116 formed at the periphery of the image display area 113 to define a cell-gap. Uniformity of the cell gap is maintained by a spacer structure (not shown) and a liquid crystal layer is formed within the cell gap.
Recently, a process has been developed that facilitates the simultaneous fabrication of a plurality of the LCD panels (such as those shown in
A liquid crystal injection hole is often formed in the seal pattern 116 and, after the joined first and second base substrates are cut, liquid crystal material can be injected through the liquid crystal injection hole and into the cell-gap of each unit LCD panel 100 to form the liquid crystal layer. Subsequently, the liquid crystal injection hole is sealed to prevent leakage of the injected liquid crystal material outside the image display area 113.
To ensure the reliability of each LCD panel 100, the seal pattern 116 must be examined to determine the presence of any defective breaks in the seal pattern 116 (i.e., breaks in the seal pattern 116 not including the liquid crystal injection hole). Generally, such examination is performed with an operator's naked eye wherein the operator stops the LCD panel production line after forming seal patterns 116 on a predetermined number of substrates (e.g., three or four), opens the seal pattern forming equipment, illuminates a seal pattern 116 with a lamp, and examines the seal pattern 116.
During the examination process described above, foreign material can be introduced onto the substrate when the seal pattern forming equipment is opened and/or when the operator actually examines the seal pattern 116. When introduced onto either the TFT array or color filter substrates 101 or 102, the foreign material creates a defective LCD panel 100. Moreover, because the examination process is performed only periodically, there is an increased likelihood that seal patterns 116 with defective breaks (e.g., breaks in portions of the seal pattern 116 other than the liquid crystal injection hole), will pass through the seal pattern forming equipment undetected, increasing the risk of forming an LCD panel 100 with a defective seal pattern 116. If liquid crystal material is subsequently injected into LCD panels having defective seal patterns 116, liquid crystal material may leak from the image display area 113 and/or the defective breaks in the seal pattern 116 must be sealed. As a consequence, material expenses incurred during LCD panel fabrication increase. Lastly, because an operator must stop the LCD panel production line to opens the seal pattern forming equipment to examine the seal pattern 116, and then restart the LCD panel production line to resume fabrication of the LCD panels, the related art examination process reduces the efficiency with which LCD panels 100 are fabricated.
Accordingly, the present invention is directed to an apparatus and a method for fabricating an LCD panel that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An advantage of the present invention provides an apparatus and a method for fabricating an LCD panel that can increase the reliability of a seal pattern examination process while reducing the time required to perform such an examination process.
Another advantage of the present invention provides an apparatus and a method for fabricating an LCD panel that can minimize the introduction of foreign materials onto a substrate and can increase the efficiency with which LCD panels are fabricated.
Still another advantage of the present invention provides an apparatus and a method for fabricating an LCD panel whereby subsequent processes are not performed on LCD panels having defective seal patterns, thereby minimizing the material expenses incurred during LCD panel fabrication.
Yet another advantage of the present invention provides an apparatus and a method for fabricating an LCD panel incorporating a buffer unit, thereby allowing seal patterns of consecutively-loaded substrates to be examined without stopping the LCD panel production line.
Still a further advantage of the present invention provides an apparatus and a method for fabricating an LCD panel capable of efficiently operating an LCD panel production line.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. These and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, an apparatus for fabricating an LCD panel may, for example, include first and second alignment treatment units for performing alignment treatments on first and second base substrates, a seal pattern forming unit for forming at least one seal pattern on the alignment-treated first base substrate, a cleaning unit for cleaning the first base substrate on which the at least one seal pattern has been formed, a disconnection examining unit operatively coupled to the cleaning unit for examining the at least one seal pattern to determined the presence of defective breaks in the at least one seal pattern, first and second buffer units for temporarily holding the first and second base substrates, respectively, and an attaching unit for loading the temporarily held first and second base substrates and for attaching the loaded first and second base substrates.
According to principles of the present invention, a method of fabricating a liquid crystal display panel may, for example, include performing a first alignment treatment on a first base substrate, performing a second alignment treatment on a second base substrate, forming at least one seal pattern on the alignment-treated first base substrate, aligning the first base substrate having the at least one seal patterned formed thereon within a disconnection examination unit, within the disconnection examination unit, driving a disconnection camera along the at least one seal pattern to detect an image of the at least one seal pattern and identify the presence of defective breaks in the at least one seal pattern, cleaning the first base substrate on which the at least one seal pattern has been formed, and attaching the first and second base substrates via the at least one seal pattern.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
In the drawings:
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
Referring to
In one aspect of the present invention, the first base substrate may constitute a substrate on which one or more color filter substrates have been formed. Similarly, the second base substrate may constitute a substrate on which one or more TFT array substrates have been formed.
According to principles of the present invention, the first and second alignment treatment units 210A and 210B may form alignment films on the surfaces of the first and second substrates, respectively. In forming the alignment films, an alignment treatment may be performed to impart a predetermined orientation to liquid crystal molecules in a subsequently provided liquid crystal layer. For example, the predetermined orientation may coincide with a direction of polymer chains found on the surface of the alignment films. Accordingly, the alignment treatment may, for example, involve a rubbing process (e.g., where fabric material is rubbed against the surface of the alignment films with substantially constant pressure and speed), an irradiation process (e.g., where light of having a suitable wavelength and predetermined intensity is irradiated onto the surface of the alignment films at a predetermined angle), or the like.
In one aspect of the present invention, the apparatus may further include first and second after-alignment treatment cleaning units 211A and 211B, respectively, coupled to respective ones of the first and second alignment treatment units 210A and 210B. The after-alignment treatment cleaning units may be used to suitably clean respective ones of the first and second base substrates after the alignment films have been formed thereon.
According to principles of the present invention, the seal pattern forming unit 220 may form seal patterns on the surface of the first base substrate after it has been alignment-treated by the first alignment treatment unit 210A. The seal patterns may be substantially leveled within the seal pattern forming unit 220 by evaporating a solvent contained within the seal patterns. Further, the seal pattern forming unit 220 may cool the first base substrate. While the seal pattern forming unit 220 has been described above as being provided to form seal patterns on the alignment-treated first base substrate, it will be appreciated that the seal pattern forming unit 220 shown in
According to principles of the present invention, the seal pattern forming unit 220 may form seal patterns having different configurations and form seal patterns according to many methods. Illustrative examples of seal pattern configurations and seal pattern forming methods will be discussed in greater detail below with respect to
Referring to
Each seal pattern 316A to 316F formed on the base substrate 300 may include a liquid crystal injection hole 304A to 304F, respectively, through which liquid crystal material may be subsequently injected to form a liquid crystal layer after the base substrate 300 has been attached to another base substrate (not shown). After injecting the liquid crystal material, the liquid crystal injection hole may be sealed to prevent liquid crystal material from leaking outside the image display area 313A to 313F.
Referring to
Each seal pattern 416A to 416F formed on the base substrate 400 may include a respective liquid crystal injection hole 404A to 404F through which liquid crystal material may be subsequently injected to form a liquid crystal layer after the base substrate 400 has been attached to another base substrate (not shown). After injecting the liquid crystal material, the liquid crystal injection hole may be sealed to prevent liquid crystal material from leaking outside the image display area 413A to 413F.
As described above, the seal patterns 316A to 316F and 416A to 416F include liquid crystal injection holes through which liquid crystal material may be injected to form a liquid crystal layer. In one aspect of the present invention, the liquid crystal material may be injected according to a vacuum injection method. Thus, in practicing the vacuum injection method, a unit LCD panel (i.e., a TFT array and color filter substrate that has been separated from a pair of first and second base substrates attached together via a seal pattern having a liquid crystal injection hole) may be introduced into a vacuum chamber. The pressure within the vacuum chamber may then be reduced and the liquid crystal injection hole may be caused to contact a reservoir of liquid crystal material provided within the vacuum chamber. Subsequently, the pressure within the vacuum chamber may be increased, causing liquid crystal material within the reservoir to be injected through the liquid crystal injection hole and into the cell gap of the unit LCD panel. After the cell gap is suitably filled with liquid crystal material, the liquid crystal injection hole may be sealed to prevent liquid crystal leakage from the unit LCD panel.
As described above, the seal pattern forming unit 220 may form seal patterns with liquid crystal injection holes defined therein. Referring to
Where, as shown in
Referring back to
According to principles of the present invention, the disconnection examining unit 240 may be coupled to the first cleaning unit 230A and may examine the seal patterns formed by the seal pattern forming unit 220 to determine the presence of any defective breaks in the seal patterned formed.
Referring to
In one aspect of the present invention, the first and second alignment cameras 610A and 610B may visually detect images of first and second alignment marks 601A and 601B formed at peripheral regions of substrate 600 and aid in aligning the substrate 600 internally, within the disconnection examining unit 240.
It should be noted that, while the seal patterns 616A to 616F are illustrated as being closed, they may also be formed to include the aforementioned liquid crystal injection holes. Further, the seal patterns 616A to 616F may be formed according to the aforementioned screen printing or dispensing methods. Accordingly, the liquid crystal layer of each unit LCD panel may be formed according to the vacuum injection method or the liquid crystal dispensing method, depending on the structure of each sealant pattern 616A to 616F.
According to principles of the present invention, the third to fifth support shafts 630A to 630C may transfer the disconnection camera 610C along the forward, backward, right, and left directions to substantially align the disconnection camera 610C with each of the seal patterns 616A to 616F, allowing images of the seal patterns 616A to 616F to be detected and magnified. In one aspect of the present invention, the first and second support shafts 620A and 620B may be positioned above or beneath the third to fifth support shafts 630A to 630C, preventing their collision with the third to fifth support shafts 630A to 630C.
According to principles of the present invention, the disconnection camera 610C may be transferred along the seal patterns 616A to 616F by cooperatively driving the third to fifth support shafts 630A to 630C to detect and magnify the images of the seal patterns 616A to 616F. The detected and magnified images may be transmitted to an operator who uses the detected and magnified images to determine the existence of defective breaks within the seal patterns 616A to 616F. In one aspect of the present invention, the defective breaks may be physically manifested as partial-thickness breaks (e.g., scratches in a surface of the seal pattern) or full-thickness breaks (e.g., complete disconnections between adjacent portions of the seal pattern). In another aspect of the present invention, the disconnection examining unit 240 may include one disconnection camera 610C. In still another aspect of the present invention, the disconnection examining unit 240 may include a plurality of disconnection cameras 610C to correspond to the number of image display areas arranged within rows and/or columns on the substrate 600. By providing a plurality of disconnection cameras 610C, the total amount of time required to examine every seal pattern 616A to 616F may be reduced.
According to principles of the present invention, the disconnection examining unit 240 may, for example, include a memory unit that receives and stores detected data corresponding to images of the seal patterns 616A to 616F detected by the disconnection camera 610C (e.g., detected line widths of the actual seal patterns 616A to 616F formed on substrate 600) as well as reference data corresponding to predetermined reference line widths of predetermined reference seal patterns; a comparing unit that compares the detected data and the reference data stored in the memory unit and that outputs a control signal if a difference between the detected and reference data exceeds a predetermined threshold value; and an alarm generating unit that receives the control signal output by the control unit and that generates an alarm based on the received control signal.
Accordingly, when a difference between the detected line width of a seal pattern and a predetermined reference line width of the seal pattern exceeds the predetermined threshold value, a defective break, as described above, exists in the actual seal pattern formed on the substrate 600. Thus, even if an operator does not continuously monitor images of the seal patterns 616A to 616F, detected and magnified by the disconnection camera 610C, the alarm generating unit may generates an alarm, indicating the existence of a defective seal pattern. Accordingly, the principles of the present invention provide a highly reliable seal pattern examination process which, in turn, improves the production yield and efficiency of the LCD panel fabrication process.
Referring back to
According to principles of the present invention, the Ag dot forming unit 260 may form a plurality of Ag dots on the second base substrate after the second substrate has been alignment-treated by the second alignment treatment unit 210B. While the Ag dot forming unit 260 has been described above as being provided to form the Ag dots on the alignment-treated second base substrate, it will be appreciated that the Ag dot forming unit 260 shown in
Referring to
Portions of the TFT array substrate 701 may not be overlapped by the color filter substrate 702. In these non-overlapped portions, a plurality of gate pads (not shown) are formed within a gate pad area on the TFT array substrate 701 and a plurality of data pads (not shown) are formed within a data pad area on the TFT array substrate 701. The gate pads may be connected to corresponding ones of a plurality of gate lines arranged within an image display area of the TFT array substrate 701 while the data pads may be connected to corresponding ones of a plurality of data lines arranged within the image display area of the TFT array substrate 701. The plurality of gate lines may substantially orthogonally cross each other to define an array of pixels. TFTs (not shown) may be provided at the crossings of the gate and data lines and be connected to corresponding pixel electrodes (not shown) arranged within each pixel. Accordingly, the TFTs may switch data signals, transmitted by corresponding ones of the data lines, to corresponding pixel electrodes in response to sequentially applied scan signals transmitted by the gate lines.
The color filter substrate 702 may, for example, support a black matrix (not shown), a plurality of color filters (not shown) separated by the black matrix, and at least one common electrode 706 opposing the plurality of pixel electrodes.
According to principles of the present invention, a common voltage line 707 may be formed on the TFT array substrate 701 to apply the common voltage to at least one common electrode 706. In one aspect of the present invention, Ag dots 708 may be formed on either the TFT array substrate 701 or on the color filter substrate 702 to electrically connect the common voltage line 707 to at least one common electrode 706, enabling a common voltage to be transmitted from the common voltage line 707 to at least one common electrode 706. In another aspect of the present invention, each unit LCD panel may include one or more Ag dots 708.
When common and signal voltages are supplied to the at least one common electrode 706 and the pixel electrodes, respectively, an electric field may be generated therebetween and through portions of the liquid crystal layer 705. Accordingly, and as shown in
Referring back to
According to principles of the present invention, the spacer forming unit 270 may form spacers having different configurations according to many methods, illustrative examples of which will be discussed in greater detail below.
In one aspect of the present invention, the spacer forming unit 270 may, for example, include equipment capable of forming spacers according to a scattering method. In practicing the scattering method, spacers are formed by scattering glass and/or plastic beads having a predetermined diameter on the first or second substrates with a suitably regular, or random, scatter density within the image display area of the LCD panel.
In another aspect of the present invention, the spacer forming unit 270 may, for example, include equipment capable of forming spacers according to a photolithography method. In practicing the photolithography method, a photoresist film is formed on the first or second substrate, the photoresist film is selectively irradiated with light (e.g., ultraviolet rays) via a mask having a light blocking region and a light transmission region, and the irradiated photoresist film is developed. Accordingly, portions of the photoresist film remaining after the developing step constitute patterned or column spacers. In one aspect of the present invention, the spacers may be formed on the first base substrate according to the photolithography method and may overlap the black matrix also formed on the first base substrate. In another aspect of the present invention, the spacers may be formed on the second base substrate according to the photolithography method. When patterned or column spacers are formed on the second base substrate, the aforementioned photolithography method may be performed before the second base substrate is loaded into the second alignment treatment unit 210B.
As shown in
After being transferred to respective ones of the first and second buffer units 250A and 250B, the first and second base substrates may be transferred to the attaching unit 280 where they may be attached together.
According to principles of the present invention, if unit LCD panels fabricated using the apparatus described above are to include liquid crystal layers formed according to the aforementioned vacuum injection method, the first and second base substrates, having been attached by the attaching unit 280, may be cut to separate the unit LCD panels from each other. After the separation, liquid crystal material may be injected through liquid crystal injection holes and into the cell-gaps of the unit LCD panels as substantially described above. Subsequently, the liquid crystal injection holes may be sealed to prevent leakage of the injected liquid crystal material outside the unit LCD panel. Therefore, the apparatus shown in
According to principles of the present invention, if unit LCD panels fabricated using the apparatus described above are to include liquid crystal layers formed according to the aforementioned liquid crystal dispensing method, liquid crystal material may be dispensed directly on one of the first or second base substrates prior to attaching the first and second base substrates. Therefore, the apparatus shown in
As described above, the principles of the present invention enable seal patterns to be examined to determine the presence of defective breaks. In one aspect of the present invention, the examination may be accomplished by the aforementioned disconnection examination unit operatively coupled, for example, to an input or an output of a cleaning unit.
Further, the principles of the present invention enable a plurality of seal patterns to be examined simultaneously and/or consecutively, without stopping the overall process of the LCD panel production line. In another aspect of the present invention, base substrates supporting examined seal patterns may be temporarily held in a buffer unit to facilitate substantially continuous LCD panel production.
Still further, the principles of the present invention enable seal patterns formed on a plurality of base substrates to be examined for the presence of defective breaks and also enables one or more substrates supporting the examined seal patterns to be temporarily held in a buffer unit when a processing unit farther along in the production line (e.g., an attaching unit) is not operating.
Moreover, the principles of the present invention enable seal patterns to be rapidly and precisely examined to determine the presence of defective breaks within seal patterns. In one aspect of the present invention, a camera may be used to detect and magnify images of seal patterns.
Further, the principles of the present invention may significantly reduce the generation of defects within the LCD panels caused by the introduction of foreign materials on substrates by eliminating the need for an operator to open and close processing equipment to manually examine the seal patterns. By eliminating the need for an operator to open and close processing equipment to manually examine the seal patterns, the amount of time required to examine the seal patterns may be reduced and the productivity of the LCD panel production line may be increased.
Still further, the principles of the present invention may improve may significantly minimize the waste of material expenses by preventing successive processes from being performed on substrates having seal pattern with defective breaks.
It will be apparent to those skilled in the art that various modifications and variation can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
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